It is in your very best interest to attend as many chair seminar events as possible!
In the seminars, you experience the nature of “tough” questions first hand. You can pass your presentation with a “well done, thank you” if you understand our motivation behind them.

Jason Turner - “Practical Performance Practices”
The talk also gives a great and compact recapitulation of construction semantics (copy, move, assign). Jason also explains that constexpr is actually not needed in many cases (something I learned from this talk)